Data/hora: 11/06/2024 01:18:54

Provedor de dados: 	65	
País: 	Brazil	
Título: 	Identification of molecular markers on bovine chromosome 18 associated to calving interval in a Brangus-Ibagé cattle herd	
Autores: 	Weimer,Tania de Azevedo; Steigleder,Clara Sabina; Machado,Márcia Silveira; Almeida,Sabrina Esteves Matos; Oliveira,João Francisco Coelho; Moraes,José Carlos Ferrugem; Henkes,Luis Ernani.	
Data: 	2007-10-01	
Ano: 	2007	
Palavras-chave: 	Microsatellites; Reproduction; Marker assisted selection; BTA 18.	
Resumo: 	In the detection phase of a bovine marker assisted selection program, this paper investigated the genetic variability of three microsatellites on the chromosome 18 (BTA 18). The possible associations between genotypes or alleles of these markers versus weight at first calving and a lifetime calving interval (as indicators of reproductive performance) were evaluated in a beef cattle herd (5/8 Aberdeen Angus x 3/8 Nelore). Eleven alleles were detected in TGLA227 and ILSTS002 and three in BMS3004, the most frequent being TGLA227*79, ILSTS002*133, ILSTS002*135 and BMS3004*129. Polymorphic information content ranged from 0.41 to 0.84, while heterozygosity ranged from 49% to 86%, with an average value of 77%. The association analyses performed between genotype classes for the genetic markers versus weight at first calving indicated no significant result. Also, no correlation was observed between calving interval (CI) and TGLA227 genotypes. However, positive associations were detected between ILSTS002 and BMS3004 and CI. Animals carrying at least one ILSTS002*135 allele presented a CI about 39 days longer than the individuals with other genotypes; animals heterozygous for BMS3004 presented a CI about 35 days shorter than the homozygous. On these grounds, it can be concluded that these markers can be useful as an aid to fertility selection, in this herd.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782007000500050	
Editor: 	Universidade Federal de Santa Maria	
Relação: 	10.1590/S0103-84782007000500050	
Formato: 	text/html	
Fonte: 	Ciência Rural  v.37 n.5 2007	
Fonte: 	info:eu-repo/semantics/openAccess